Excavator



A. M. HOOD June 29 1926.

EXCAVATOR Filed Jan. 8, 1925 INVENTOR. A flrZ/mrM. H0005,

A TTORNEYS Patented June 29, 1926.

UNITED 'smrss ARTHUR M1. HOOD, OF INDIANAPOLI$, INDIANA.

Application filed January The object of my invention is to produce an.excavator of" the dipper type in which the digging swing and forwardcrowd is accomplished by a. single cable and the return lift andresistance to crowd is accomplished by an independent coordinatedlifting means.

The accompanying drawings illustrate myinvention.- Fig. 1 is a sideelevation largely diagrammatic in character, illustrating an embodimentof my invention and Figs. 2 and 3 are diagrammatic illustrations ofequivalent rope reavings.

Inv Fig. 1 10 indicates. a. suitable supporting structure as, forinstance, a truck which may be motorized, the truck being provided with.a turn table- 11, an, anchorage mast 12 and a motor 13 equipped with twowinding drums 14 and 15, all being of common construction andthe axis ofthe turn table 11 being vertically beneath the upper end of theanchoragemast. 12. The above described construction: maybe oi -any ordinarywellknown character.

Supported upon turn table 11 is an upwardly and outwardly extended boom16 supported at a desired inclination from the upper end of mast 12 by astretcher bar 17 and suspension cables 18. Mounted on the outer end ofboom 16 is a sheave shaft 20 upon which is journaled a sheave 21. r

Boom 16 is conveniently formed of two parallel laterally spaced channelsso that the sheave 21 may lie between the channels as indicated.

Journaled upon shaft 20 is a swinging yoke 23 which forms a guide for adipper handle 24 which is conveniently made of two parallel spacedchannels, one lying upon each side of the sheave 21 and lying betweenthe channels of boom 16, the arrangement being such that the dipperhandle 24 is freely slidable in yoke 23 and is swingable about shaft 20as an axis. The outer end of the dipper handle 24 carries a dipper 25 ofany well-known form, the details of which form no part of my presentinvention.

The upward retracting movement of the dipper handle is accomplished by apull back cable 26 in the present instance anchored to the outer end ofthe dipper handle. Of course it will be understood that cable 26 may beassociated with the dipper handle 24 in any desired manner so 8,, 1925.Serial No. 1,138.

that a pull on the cable will serve to shift the dipper handlelongitudinally inwardly.

around the sheave of a snatch block 31 car'- ried at the outer end ofthe yoke 32 pivoted at 33 upon boom 16.jthence forwardly around sheave21, thence around sheave 34 at the inner end of dipper handle 24 andthence to a yoke 35 anchored conveniently .upon shaft 20. Anchored uponthe outer end of yoke 32 is the lifting cable 36 which passes down overa sheave 37, coaxial with sheavew28, thence down through'the turn tableand'around a sheave 38 coaxial with the sheave '29 and thence to thewinding drum 15. i

A pull upon cable 36 will act upon cable 30 to simultaneously swing thedipper 25 upwardly and crowd the dipper handle 24 outwardly, the extentof the crowding movement being determined by the extent to which cable26 is released or held against movement.

In Fig. 2the cable 30 is anchored at one end to the inner end of thedipper handle, passing thence to and around snatch block 31, thencearound sheave 21 to and around sheave 34, thence around sheave 21coaxial with sheave 21, and thence to an anchorage at the inner end ofthe handle.

In Fig. 3 the cable 30 is anchored at one end to the snatch block 31,passes from thence to and around a sheave 34 coaxial with sheave 34,thence to and around the sheave of snatch block 31, thence to sheave 21,thence to and around sheave 34 and thence to an anchorage on shaft 20.

It will be readily understood that an al most infinite variety ofreavings of the cable 30 may be utilized without departing from myinvention. I

I claim as, my invention:

1. An excavator comprising a boom a dipper handle slidably and swingablylmounted upon said boom, a lifting cable anchored upon the boom andpassing from thence around a sheave on the inner end of end of thedipper handle, and a connection between said snatch block and windingmechanism.

2. An excavator comprislng a boom, a d pper handle slidably andswingably vmounted upon said boom, a lifting cable anchoredupo n theboom and passing from thence around a sheave on the inner end of thedipper handle, thence arounda sheave on the boom, thence around a snatchblock supported upon the boom and thence to an anchorage on theinner endof the dipper handle, and a connection between said snatch block andwinding mechanism.

3. An excavator comprising ahandled dipper, a support on which saidhandle is slidably and swingably mounted, a cable having one endanchored on the support the other end associated with one end of thehandle and an intermediate bight in end thrust engagement with thehandle, a snatch block engaging an intermediate portion of said cableand supported on said support, means for shifting said snatch block, andmeans for resisting the end thrust of said bight.

4:. An excavator comprising a handled dipper, a support on which saidhandle is slidably and swingably mounted, a cable hav- .sociated withsaid support and with said handle at two points to exert an end thrustand a swing thereon,-a snatch block engaging an intermediate portion ofsaid cable, means for shiit'tin said snatch block, and

means for resisting the aforesaid end thrust.

6. An excavator comprising a handled dipper, a support on which saidhandle is slidably and swingably mounted, a cable associated with saidsupport and at two points in its length with said handle at one endthereof to exert end thrust and a swing thereon, a snatch block engagingan intermediate portion of said cable, means. for shifting said snatchblock, and means for resisting the aforesaid end thrust.

In witness whereof, I have hereunto set my hand at Indianapolis,Indiana, this 6th day of January, A. D. one thousand" nine hundred andtwenty five.

ARTHUR M, HOOD.

